debugging in dev container can now step into Rust Std code (#219)

.devcontainer/devcontainer.json

@@ -25,16 +25,22 @@
     // This will ignore your local shell user setting for Linux since shells like zsh are typically
     // not in base container images. You can also update this to an specific shell to ensure VS Code
     // uses the right one for terminals and tasks. For example, /bin/bash (or /bin/ash for Alpine).
-		"terminal.integrated.shell.linux": null
+    "terminal.integrated.shell.linux": null,
+    // https://github.com/vadimcn/vscode-lldb/issues/204
+    // https://users.rust-lang.org/t/solved-how-to-step-into-std-source-code-when-debugging-in-vs-code/25319/5
+    "lldb.executable": "rust-lldb",
+    "lldb.launch.sourceLanguages": ["rust"],
+    // CodeLLDB sourceMap supports Globs!
+    // https://github.com/vadimcn/vscode-lldb/blob/master/CHANGELOG.md#070
+    "lldb.launch.sourceMap": {
+      "/rustc/*/": "/usr/local/rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust"
+    }
   },
   // Uncomment the next line if you want to publish any ports.
   // "appPort": [],
   // Uncomment the next line to run commands after the container is created - for example installing git.
   // "postCreateCommand": "apt-get update && apt-get install -y git",
   // Add the IDs of extensions you want installed when the container is created in the array below.
-	"extensions": [
-		"vadimcn.vscode-lldb",
-		"rust-lang.rust"
-	],
+  "extensions": ["vadimcn.vscode-lldb", "rust-lang.rust"],
   "postCreateCommand": "rustup toolchain install stable && rustup component add rls rust-src rust-analysis --toolchain stable"
 }